I actually got this from someone who was a fish enthusiast and they sold it to me ^^' They love salt water fish and told me they needed to sell their fresh water supplies. I don't know if this gravel was salt/fresh in particular but i'm willing to part with almost all of it and there is tons of it! o_o lets hope for some answer...

Edit: I also have black gravel, brown natural looking gravel and white gravel for sale! I don't need these XD They were all completely washed, cleaned and had no debris or coloration to the water once cleaned. So i'm asking these questions about this blue gravel :o